
/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
#include "SampleCode.h"
#include "SkView.h"
#include "SkBlurMaskFilter.h"
#include "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkGraphics.h"
#include "SkImageDecoder.h"
#include "SkPath.h"
#include "SkRandom.h"
#include "SkRegion.h"
#include "SkShader.h"
#include "SkUtils.h"
#include "SkXfermode.h"
#include "SkColorPriv.h"
#include "SkColorFilter.h"
#include "SkTime.h"
#include "SkTypeface.h"

#include "SkOSFile.h"
#include "SkStream.h"

static void check_for_nonwhite(const SkBitmap& bm, int alpha)
    {
    if (bm.config() != SkBitmap::kRGB_565_Config)
        {
        return;
        }

    for (int y = 0; y < bm.height(); y++)
        {
        for (int x = 0; x < bm.width(); x++)
            {
            uint16_t c = *bm.getAddr16(x, y);
            if (c != 0xFFFF)
                {
                SkDebugf("------ nonwhite alpha=%x [%d %d] %x\n", alpha, x, y, c);
                return;
                }
            }
        }
    }

class TextAlphaView : public SampleView
    {
    public:
        TextAlphaView()
            {
            fByte = 0xFF;
            }

    protected:
        // overrides from SkEventSink
        virtual bool onQuery(SkEvent* evt)
            {
            if (SampleCode::TitleQ(*evt))
                {
                SkString str("TextAlpha");
                SampleCode::TitleR(evt, str.c_str());
                return true;
                }
            return this->INHERITED::onQuery(evt);
            }

        virtual void onDrawContent(SkCanvas* canvas)
            {
            const char* str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
            SkPaint paint;
            SkScalar    x = SkIntToScalar(10);
            SkScalar    y = SkIntToScalar(20);

            paint.setFlags(0x105);

            paint.setARGB(fByte, 0xFF, 0xFF, 0xFF);

            paint.setMaskFilter(SkBlurMaskFilter::Create(SkIntToScalar(3),
                                SkBlurMaskFilter::kNormal_BlurStyle));
            paint.getMaskFilter()->unref();

            SkRandom rand;

            for (int ps = 6; ps <= 35; ps++)
                {
                paint.setColor(rand.nextU() | (0xFF << 24));
                paint.setTextSize(SkIntToScalar(ps));
                paint.setTextSize(SkIntToScalar(24));
                canvas->drawText(str, strlen(str), x, y, paint);
                y += paint.getFontMetrics(NULL);
                }
            //check_for_nonwhite(canvas->getDevice()->accessBitmap(), fByte);
            //SkDebugf("------ byte %x\n", fByte);

            if (false)
                {
                fByte += 1;
                fByte &= 0xFF;
                this->inval(NULL);
                }
            }

        virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y)
            {
            return new Click(this);
            }

        virtual bool onClick(Click* click)
            {
            int y = click->fICurr.fY;
            if (y < 0)
                {
                y = 0;
                }
            else if (y > 255)
                {
                y = 255;
                }
            fByte = y;
            this->inval(NULL);
            return true;
            }

    private:
        int fByte;

        typedef SampleView INHERITED;
    };

//////////////////////////////////////////////////////////////////////////////

static SkView* MyFactory()
    {
    return new TextAlphaView;
    }
static SkViewRegister reg(MyFactory);

